Atropine is an effective treatment of moderate amblyopia. Reduction of the plus sphere for the sound eye is an accepted method of enhancing and possibly accelerating the treatment effect. Demonstrating additional value of the plano lens in terms of speed of improvement will shorten the treatment period, possibly improving child and parental compliance, leading to improved overall outcomes for patients with amblyopia. If the plano lens leads to greater improvement, then there will be less permanent visual impairment in patients with a history of amblyopia. It also is important to determine if the use of a plano lens in conjunction with atropine has a deleterious effect on the sound eye, and if yes, how often this occurs.